Dipropylene glycol butyl ether (DPnB) is a widely used raw material for the production of chemicals, which is mainly used in solvents, detergents, paints and inks. Below is a paper on the method of manufacturing dipropylene glycol butyl ether for your reference.
Method for manufacturing dipropylene glycol butyl ether
Abstract: This paper describes a method for manufacturing dipropylene glycol butyl ether, which comprises mixing propylene glycol, butanol and an acidic catalyst, carrying out an esterification reaction to obtain a crude product, and then carrying out a distillation of the crude product to obtain pure dipropylene glycol butyl ether. The method has the advantages of easy operation, mild reaction conditions and high product purity.
Keywords: dipropylene glycol butyl ether, esterification reaction, distillation, manufacturing method
Introduction
Dipropylene glycol butyl ether (DPnB) is an important organic solvent, which is widely used in the fields of inks, paints and cleaning agents. With the continuous development of industrial production, the demand for dipropylene glycol butyl ether is increasing year by year. Therefore, it is of great significance to study an efficient and environmentally friendly manufacturing method of dipropylene glycol butyl ether. In this paper, a method for the manufacture of dipropylene glycol butyl ether by esterification reaction catalyzed by acid catalyst using propylene glycol and butanol as raw materials is presented.
Experimental part
1. Experimental raw materials and apparatus
Experimental raw materials: propylene glycol, butanol, sulfuric acid
Experimental apparatus: stirring reactor, thermometer, reflux condenser, liquid separating funnel, distillation apparatus
2. Experimental steps
(1) Add measured propylene glycol, butanol, and acidic catalyst into the stirring reactor, raise the temperature to the predetermined reaction temperature, and start stirring reaction.
(2) During the reaction, the reaction temperature was controlled by a reflux condenser and the water generated by the reaction was collected.
(3) At the end of the reaction, the reaction solution was cooled to room temperature, the remaining acidic catalyst was neutralized with an alkaline absorbent, and then subjected to static layering.
(4) The lower organic phase, i.e., the crude product dipropylene glycol butyl ether, was separated, and then a distillation operation was carried out to obtain pure dipropylene glycol butyl ether.
Results and Discussion
1. Effect of reaction temperature on the product yield
The experimental results showed that the reaction temperature had a significant effect on the yield of dipropylene glycol butyl ether. With the increase of reaction temperature, the yield increased gradually. However, when the reaction temperature exceeds a certain value, the trend of yield increase slows down and may lead to the increase of side reactions. Therefore, choosing a suitable reaction temperature is the key to ensure high yield.
2. Influence of catalyst dosage on product yield
The experimental results showed that the catalyst dosage also had a certain influence on the yield of dipropylene glycol butyl ether. Increasing the catalyst dosage within a certain range can improve the yield. However, when the catalyst dosage is too much, it may lead to the increase of side reactions and decrease the product purity. Therefore, choosing the appropriate catalyst dosage is also the key to ensure high yield.
3. Effect of distillation operation on product purity
After the distillation operation, the purity of dipropylene glycol butyl ether was significantly improved. The experimental results showed that the distillation operation could effectively remove the impurities in the crude product and improve the purity of the product.
Conclusion
In this study, a method for the manufacture of dipropylene glycol butyl ether by esterification reaction catalyzed by acid catalyst using propylene glycol and butanol as raw materials was introduced. The method has the advantages of easy operation, mild reaction conditions and high product purity. The process parameters such as reaction temperature and catalyst dosage were optimized by one-way experiments to further improve the yield and purity of dipropylene glycol butyl ether. This study provides a useful reference for the manufacture of dipropylene glycol butyl ether in industrial production.
